improved performance and battery usage on older devices

lib/api/marianumcloud/talk/talk_api.dart

@@ -30,6 +30,10 @@ abstract class TalkApi<T extends ApiResponse?> {
   );
   T assemble(String raw);
 
+  /// Override to parse large payloads off the UI isolate (e.g. via `compute`
+  /// with a top-level parser); defaults to the synchronous [assemble].
+  Future<T> assembleAsync(String raw) async => assemble(raw);
+
   Future<T> run() async {
     final endpoint = NextcloudOcs.uri(
       'apps/spreed/api/$path',
@@ -69,7 +73,7 @@ abstract class TalkApi<T extends ApiResponse?> {
     }
 
     try {
-      final assembled = assemble(data.body);
+      final assembled = await assembleAsync(data.body);
       assembled?.headers = data.headers;
       return assembled;
     } catch (e) {